National Stock Number
5640-00-243-9475
National Stock Number (NSN) 5640-00-243-9475, or NIIN 002439475, (insulation,thermal) was assigned January 1, 1961 in the Federal Logistics Information System (FLIS). This NSN replaces 1 stock number, 5640002671561.
There are no manufacturer part numbers associated to this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is unique to one weapons system.
This NSN is assigned to Item Name Code (INC) 04923. [A LOOSE MASS OF GLASS WOOL, MINERAL WOOL, VEGETABLE FIBERS, OR DIATOMACEOUS EARTH AS ORIGINALLY PROCESSED WITHOUT REGARD TO FORM OR DIMENSIONS, PRIMARILY DESIGNED AS LOOSE FILL FOR OFFERING RESISTANCE TO THE FLOW OF HEAT. DO NOT USE IF A MORE SPECIFIC ITEM NAME EXISTS. EXCLUDES:ELECTRICAL INSULATING COMPOUNDS AND CORK STRIP.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no information in the HMIRS; however, the NSN is in an FSC in Table II of Federal Standard 313 and an MSDS may be required by the user. The requirement for an MSDS is dependent on a hazard determination of the supplier or the intended end use of the product. NSN 5640002439475 does not contain precious metals.
This information was last updated on Aug 01, 2025.